Princeton's WordNet
snorkel, schnorkel, schnorchel, snorkel breather, breather(noun)
air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time
Synonyms:
breathing spell, breathing space, breathing time, snorkel breather, breath, schnorchel, breather, breathing place, schnorkel, snorkel
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